Here’s what’s actually inside the nuclear football

A military aide is always present with the President of the United States, carrying a black leather briefcase known as the "nuclear football". This aide is a mid-grade officer chosen for their reliability and discretion. They accompany the President at all times, regardless of location or circumstances.

The briefcase, also referred to as the Presidential Emergency Satchel, has a significant role in the country's security. Its existence is tied to the history of nuclear weapons in the United States and the Soviet Union during President Dwight D. Eisenhower's term.

Further details about the nuclear football and its story are available from the source, including how it came to be and the events that led to its creation.